Hi, I have been to one of these today with an error code E4.
I have checked to see that it has operated the aquastop switch and the base of the machine had quite a bit of water in it.
I have now removed the water and tested it and the machine will only take a very small amount of water before the heater comes on.
So It seems that the machine has over filled and now its under filling.
Can the pressure switch cause this fault?
One other thing I noticed was that the time left on the display was jumping up and down from 18 to 19 mins
Cheers, Ray